import Lean
open Lean Elab Tactic

/-- info: hello world -/
#guard_msgs in
run_cmd logInfo m!"hello world"

/-- info: ! -/
#guard_msgs in
run_cmd unsafe do logInfo "!"

example : True := by
  run_tac
    evalApplyLikeTactic MVarId.apply (← `(True.intro))

example : True := by_elab
  Term.elabTerm (← `(True.intro)) none